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Check your adapter mounts

I have 4 adapters and all of them the mounts where lose. 2 Metabones 1 Novaflex and the Sony adapter I had to tighten down every one of them with a small Phillips head. This could lead to many issues. These are all brand new. These are all on the lens side of the adapters . Get your screwdrivers out and check them.

Photography is all about experimentation and without it you will never learn art.

Re: Check your adapter mounts

"There's almost certainly a recommended torque setting. The screws may not be designed to be fully tightened, to allow for thermal expansion."

Torque recommendations are normally set based on the bolt/thread material and thread size, to ensure that the fastener is tight enough not to loosen, but not so tight as to strip the threads. I think it unlikely that adapter designers would expect fasteners to be looser that proper to shim a lens.